JP2006043626A - Water treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high power, highly capacity, and compact-sized water treatment apparatus. <P>SOLUTION: The water treatment apparatus comprises a mixing container for mixing a continuously supplied flocculant and polluted water, a stirring container for stirring the mixed polluted water by water current, a flocculating container for flocculating the stirred polluted water, a flocculating and precipitating tank containing the flocculating container and flocculating and precipitating the primarily treated water discharged out of the flocculating container, a filtrating tank for filtrating the secondarily treated water overflowing the flocculating and precipitating tank and discharged out of the tank and whose filtration capability is recovered by washing the filtration layer by introducing air from outside when the filtration capability is decreased. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a water treatment apparatus for aggregating and precipitating filth in wastewater using a flocculant.

Conventionally, as the water treatment apparatus, an activated sludge method or a device for separating filth using a filter has been adopted. On the other hand, in recent years, polymer flocculants and zeolite flocculants have been developed. By putting them into sewage and stirring rapidly, it is possible to agglomerate and precipitate the sewage to treat the water.

However, a water treatment apparatus that uses these flocculants efficiently and has a large amount of treated water has not been developed. After examination, the following points are issues to be solved. First, the inorganic polymer flocculant used in the present invention needs to be rapidly mixed and stirred in 7 to 12 seconds. Second, the flocculant breaks up the aggregates when mechanically stirred. Third, it is necessary to efficiently coagulate and precipitate the agglomerated agent and sewage that have been stirred.

An object of the present invention is to provide a compact water treatment apparatus that solves these problems, is efficient, has a large treatment capacity, and is compact.

The water treatment apparatus of the present invention comprises a mixing vessel for mixing a flocculant continuously fed from a flocculant charging machine and wastewater introduced from the outside, and stirring for rapidly stirring the mixed wastewater using a water flow. A container, an agglomeration forming container for forming agglomerates larger by introducing sewage water rapidly stirred by the stirring vessel and slowly stirring by vortex, agglomeration settling tank for precipitating the agglomerated aggregates, and the agglomeration The present invention solves the above-mentioned problems by having a filtration tank that discharges the filtered water that is attached to the filth in the sewage that floats and flows out of the settling tank in the filtration layer.

INDUSTRIAL APPLICABILITY The present invention can be widely used for improving water quality of food wastewater, factory wastewater, high turbidity treatment, miscellaneous wastewater, ponds, swamps, and lakes.

Since the present invention does not require a vast installation site, it is a high turbidity water treatment in dams and tunnel constructions, etc., and the conventional device used a huge device, but it requires a vast land, but the present invention is used. By doing so, the installation location can be reduced. It can also be installed in small construction sites such as urban areas due to its small size.

Since the present invention can be used for food wastewater, factory wastewater, high turbidity treatment, and miscellaneous wastewater, even if it is necessary to expand existing facilities due to business expansion, etc., this device is installed without adding drainage facilities. Therefore, it is possible to improve the processing capacity.

The filtration layer cleaning system of this apparatus has the advantage that it does not require cleaning water unlike normal filter layer cleaning, and does not generate cleaning waste water.

BEST MODE FOR CARRYING OUT THE INVENTION

This water treatment apparatus is roughly divided into a flocculant charging device, a mixing vessel, a stirring vessel, a coagulating sedimentation tank, and a filtration tank.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 shows the overall configuration of the water treatment system.

The flocculant charging device 2 uses a powder flocculant charging device when using a powder flocculant, and a liquid flocculant injection pump when using a liquid flocculant. In order to efficiently mix the waste water introduced from the outside and the flocculant continuously added from the flocculant feeder, the flocculant is continuously added from the upper part of the mixing vessel.

A sewage water conduit 1 is connected to the side surface of the mixing vessel 3. When the pressurized sewage from the water conduit 1 is introduced into the mixing vessel 3, the sewage falls along the inner wall of the mixing vessel 3 while forming a vortex. Since the flocculant is continuously added from the flocculant feeder 2 into this vortex, the sewage and the flocculant are stirred and the stirring plate 10 provided at the top of the stirring vessel 4 through the hole at the bottom of the mixing vessel 3. Guided up.

FIG. 2 shows the detailed structure of the stirring vessel 4. 6 to 8 stirring plates are connected to the inner wall of the stirring vessel 4 in the horizontal direction, the 6 to 8 stirring plates are fixed to one inner wall of the stirring vessel, and sludge is deposited between the opposite inner walls. It is attached alternately so that a gap that can be dropped without causing a gap is generated. Further, the odd-numbered first, third, fifth and seventh stage plates 10 of the stirring plate are fixed only on the flat plate, and the even-numbered second, fourth, sixth and eighth stage plates 11 are placed on the flat plate 11. Several flat plates 12 are fixed vertically. And the sewage containing the flocculant flows on the odd-numbered first-stage plate 10 of this stirring plate, collides with the inner wall of the stirring vessel 4, falls to the lower even-numbered second-stage plate 11 of the stirring plate, While colliding violently with the flat plate 12 vertically fixed on the flat plate 11 several times and colliding with the inner wall of the stirring vessel 4, the sewage containing the flocculant is a flat plate which is the lower third stage stirring plate. It accelerates on 10 and flows. Thus, the sewage containing the flocculant is sufficiently mixed by repeating the stirring and acceleration, and introduced into the flocculation / sedimentation tank 7 from the sewage outlet 14 provided at the bottom of the stirring vessel 4 through the water conduit 5.

In order to sufficiently stir the pressurized sewage introduced from the outside in the stirring vessel 4, it is necessary to release the air in the stirring vessel to the outside. For this purpose, the piping 13 is raised from the bottom of the stirring vessel 4 and opened to the atmosphere at a position higher than the mixing vessel.

FIG. 4 shows the detailed structure of the coagulation sedimentation tank 7. The coagulation sedimentation tank 7 precipitates filth in the sewage water aggregated by the coagulant. The coagulation sedimentation tank 7 is installed in the coagulation sedimentation tank 7 from the sewage outlet 14 provided at the bottom of the stirring vessel 4 through the water conduit 5. In the agglomeration container 6 which is a cylindrical body, the agitation container 4 in which the flocculant and sewage are sufficiently mixed flows through the water conduit 5.

FIG. 3 shows the detailed structure of the agglomeration container 6. Since the flocculant used in this apparatus has a high agglomeration effect by stirring slowly after rapid stirring, several stages of spiral plates 16 are attached above the inside of the agglomeration forming container 6. When the sewage is sufficiently stirred rapidly, the spiral plate 16 is attached to the sewage and falls downward while slowly turning. After passing, the filth in the sewage is collected from the bottom of the cylinder while maintaining the turning force below the cylinder, and quickly settled as a larger agglomerate on the bottom of the aggregation sedimentation tank 7.

The agglomeration vessel 6 is buried in the agglomeration sedimentation tank 7 and has an effect of limiting the water flow speed by the load of water pressure and making the capacity of the agglomeration sedimentation tank 7 smaller than the conventional one.

The sewage obtained by aggregating the sewage in the sewage in the agitation container 4 and the agglomeration container 6 is separated into the collected sewage and the treated primary treated water.

The primary treated water diffused into the coagulation sedimentation tank 7 from the lower part 17 of the coagulation formation vessel overflows the supernatant water from the overflow weir 18 provided in the upper part of the coagulation sedimentation tank 7 by the rising water flow.

The primary treated water that has passed through the spiral plate 16 is formed with large aggregates and fine aggregates. The large aggregates are deposited on the bottom of the aggregation sedimentation tank 7, and the fine aggregates ride on the rising water flow and accumulate in the aggregation sedimentation tank. The overflow overflows from the overflow weir 18 provided at the top of 7. This is treated as secondary treated water, and the secondary treated water falls like a waterfall into the filtration tank 8 adjacent below.

5 and 6 show the detailed structure of the filtration tank 8. In the filtration tank 8, the secondary treated water that overflows from the coagulation sedimentation tank 7 and falls like a waterfall passes through the lower part of the partition plate 20, passes through the porous plate 21, and is introduced into the filtered tank 8. Is filtered through the filter layer 22 from the bottom to the top.

This filtration layer 22 is a plastic vertical 5 cm × width 5 cm × thickness 1 mm mesh, and a substance having buoyancy in water is used as the filter medium 31, and this is laminated in the filtration tank 8 to a thickness of 20 cm. Filtration is performed by adhering the secondary treated water to the filter medium 31 in the filter layer. Further, an air diffuser 9 that generates a large number of bubbles is provided below the filtration layer 22 in the filtration tank 8, and the bubbles are configured to be applied to one side of the filtration layer 22. Air is supplied to the air diffuser 9 from the outside, so that the filter medium 31 of the filter layer 22 is forcibly convected in the filter tank 8. By this convection, fine aggregates and the like adhering to the filter medium 31 are peeled off and washed. By this cleaning, when the ability of the filtration layer 22 decreases with the increase in the amount of deposits, the ability is recovered by supplying air from the outside, and the filtration state is restored.

A discharge pipe 26 and a valve 25 are provided at the bottom of the coagulation sedimentation tank 7, and by opening the valve 25, the filth that has accumulated in the coagulation sedimentation tank 7 can be discharged. Further, discharge pipes 28 and 30 are provided at the bottom of the filtration tank 8. When the valve 27 connected to the discharge pipe 28 is opened, the filth in the place on the coagulation sedimentation tank 7 side partitioned by the perforated plate 21 is discharged. When the valve 29 connected to the pipe 30 is opened, the filth accumulated in the lower portion of the filtration layer 22 can be discharged.

It is a figure which shows the system configuration | structure of the water treatment apparatus concerning embodiment of this invention. It is sectional drawing of a stirring container. It is a side view of an aggregation formation container. It is a side view of a coagulation sedimentation tank. It is a top view of a coagulation sedimentation tank. It is sectional drawing of a filtration tank. It is a top view of a filter medium. It is AA sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water guide pipe 2 Coagulant injection machine 3 Mixing container 4 Stirring container 5 Water guide pipe 6 Aggregation formation container 7 Coagulation sedimentation tank 8 Filtration tank 9 Aeration pipe 10 Stirring plate 11 Stirring plate 12 Stirring plate 13 Air escape pipe 14 Sewage outlet 15 Inlet 16 Spiral plate 17 Agglomeration forming container outlet 18 Overflow weir 19 Coagulation sedimentation tank outlet 20 Partition plate 21 Porous plate 22 Filtration layer 23 Overflow weir 24 Filtration layer outlet 25 Valve 26 Discharge piping 27 Valve 28 Discharge piping 29 Valve 30 Discharge piping 31 Filter media

Claims (4)

A mixing container for mixing the flocculant introduced from the flocculant charging machine and the sewage introduced from the outside, a stirring container for introducing and stirring the sewage mixed by the mixing container, and the sewage stirred thereby are introduced. A water treatment comprising: an agglomeration container for agglomerating and forming a soil; an agglomeration sedimentation tank for aggregating and sedimenting the agglomerated waste; and a filtration tank for discharging water obtained by filtering the agglomerate treated in the agglomeration sedimentation tank. apparatus. The stirring vessel is a stirring portion in which a plurality of stirring plates for stirring sewage introduced from a mixing vessel having a sewage introduction portion and a flocculant introduction portion from the outside are combined and connected, and the stirred sewage and the flocculant. The water treatment apparatus according to claim 1, further comprising a stirring vessel having a drain port provided for discharging water. The agglomeration sedimentation tank comprises a coagulation formation container that is vortexed by connecting a plurality of spiral plates in a cylindrical shape and discharged from a drain outlet provided in the lower part, and sewage introduced from the lower part of the aggregation formation container. The water treatment device according to claim 1, further comprising an overflow wall for precipitating at the bottom and overflowing sewage from the upper part of the coagulation sedimentation tank, and a drain outlet for discharging the overflowed sewage. The water treatment apparatus according to claim 1, wherein the filtration tank has a function of recovering the ability of the filter medium that decreases with use by introducing air.

Images